Re: Process balancing on smp db server/apache web serve

What OS are you using that "assigns" a cpu to a process at start up?  I
believe that all of our multiprocessor machines (Linux, Sun, HP, AIX, IRIX,
Dec^Wcompaq^WHP) will run a ready process on whatever cpu is available.

-ron

> -----Original Message-----
> From: Peter Darley [mailto:pdarley@kinesis-cem.com]
> Sent: Thursday, May 23, 2002 6:56 AM
> To: Pgsql-General
> Subject: [GENERAL] Process balancing on smp db server/apache
> web server
>
>
> Friends,
>     I have been thinking about my smp db server and how it
> interacts with my
> web server.  I'm using mod_perl on Apache, which uses
> Apache::DBI to connect
> to the db server via a private network segment.  It occurs to
> me that since
> the web server is connecting early (on startup), when there
> is probably no
> load on the db server, the cpu that each backend is assigned
> to will be
> largely random, or, if there is a large syslogd operation or
> something right
> at that time, it might even put the majority of backends on the same
> processor.
>     When someone hits the web site it seems to me that
> there would be a greater
> than 50% chance that any two large queries from the web
> server would end up
> being run on the same processor.  Similarly, if I start a
> large processing
> script that uses the db, since the web associated backends are already
> assigned to a processor, there's a good (~50%?) chance that
> any big queries
> that come in through the web will be on the loaded cpu.
>     Does this make sense to anyone?  If this is true, are
> there any suggestions
> about how I can keep my persistent connections from Apache,
> while getting
> the db server to balance the load more efficiently?
> Thanks,
> Peter Darley
>
>
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